(Please note that if you have OS X 10.7 or later you can get Lingon 3 instead which is easier to use but also only can create jobs as the current user.)

With Lingon you can schedule things to happen automatically on your Mac.

Uses
• Do you ever want to start an app at a given time?
• Do you ever want to run a script e.g. every hour?
• Do you ever want make sure that an app automatically restarts if it crashes?
• Do you ever want to monitor a folder and do something if is modified?
Lingon can do all this for you and much, much more

Background
All Macs include something called launchd in the system which can schedule things. But it can be quite complicated to configure it as it requires complicated text files formatted exactly to some rules. Lingon takes care of all this for you and presents a simple interface where you can fill in what you want to do and then it is taken care of in the background.

Powerful
In Lingon you can see all configuration files that exists in the system. And if you need to make a configuration that is not included in the interface you can switch to a text mode and with some help include all configuration possibilities.